Using mercury stable isotopes to quantify directional soil‒ atmosphere Hg(0) exchanges in rice paddy ecosystems: Implications for Hg(0) emissions to the atmosphere from land surfaces

Zhang, Kun; Pu, Qiang; Liu, Jiang; Hao, Zhengdong; Zhang, Lijuan; Zhang, Leiming; Fu, Xuewu; Meng, Bo; Feng, Xinbin

doi:https://science-ouverte.canada.ca/handle/123456789/2641

Using mercury stable isotopes to quantify directional soil‒ atmosphere Hg(0) exchanges in rice paddy ecosystems: Implications for Hg(0) emissions to the atmosphere from land surfaces

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dc.contributor.author: Zhang, Kun; Pu, Qiang; Liu, Jiang; Hao, Zhengdong; Zhang, Lijuan; Zhang, Leiming; Fu, Xuewu; Meng, Bo; Feng, Xinbin
dc.date.accepted: 2024-06-05
dc.date.accessioned: 2024-06-27T19:58:06Z
dc.date.available: 2024-06-27T19:58:06Z
dc.date.issued: 2024-06-12
dc.date.submitted: 2024-02-29
dc.description.abstract - en: Gaseous elemental mercury (Hg(0)) emissions from soils constitute a large fraction of global total Hg(0) emissions. Existing studies do not distinguish biotic- and abiotic-mediated emissions and focus only on photoreduction mediated emissions, resulting in an underestimation of soil Hg(0) emissions into the atmosphere. In this study, directional mercury (Hg) reduction pathways in paddy soils were identified using Hg isotopes. Results showed significantly different isotopic compositions of Hg(0) between those produced from photoreduction (δ202Hg = −0.80 ± 0.67‰, Δ199Hg = −0.38 ± 0.18‰), microbial reduction (δ202Hg = −2.18 ± 0.25‰, Δ199Hg = 0.29 ± 0.38‰), and abiotic dark reduction (δ202Hg = −2.31 ± 0.25‰, Δ199Hg = 0.50 ± 0.22‰). Hg(0) exchange fluxes between the atmosphere and the paddy soils were dominated by emissions, with the average flux ranging from 2.2 ± 5.7 to 16.8 ± 21.7 ng m−2 h−1 during different sampling periods. Using an isotopic signature-based, ternary mixing model, we revealed that photoreduction is the most important contributor to Hg(0) emissions from paddy soils. Albeit lower, microbial and abiotic dark reduction contributed up to 36 ± 22% and 25 ± 15%, respectively, to Hg(0) emissions on the 110th day. These novel findings can help improve future estimation of soil Hg(0) emissions from rice paddy ecosystems, which involve complex biotic-, abiotic-, and photo-reduction processes.
dc.description.fosrcfull - en: This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Environmental Science & Technology, copyright © 2024 American Chemical Society after peer review. To access the final edited and published work see <a href="https://doi.org/10.1021/acs.est.4c02143">https://doi.org/10.1021/acs.est.4c02143</a>.
dc.description.fosrcfull-fosrctranslation - en: Ce document est la version non éditée d'un travail soumis par l'auteur qui a été accepté pour publication dans Environmental Science & Technology, droit d'auteur © 2024 American Chemical Society après évaluation par les pairs. Pour accéder au travail final édité et publié, voir <a href="https://doi.org/10.1021/acs.est.4c02143">https://doi.org/10.1021/acs.est.4c02143</a>.
dc.identifier.issn: 0013-936X; 1520-5851
dc.identifier.uri: https://science-ouverte.canada.ca/handle/123456789/2641
dc.language.iso: en
dc.publisher: American Chemical Society
dc.relation.isreplacedby: https://doi.org/10.1021/acs.est.4c02143
dc.rights - en: Open Government Licence - Canada
dc.rights - fr: Licence du gouvernement ouvert - Canada
dc.rights.openaccesslevel - en: Green
dc.rights.openaccesslevel - fr: Vert
dc.rights.uri - en: https://open.canada.ca/en/open-government-licence-canada
dc.rights.uri - fr: https://ouvert.canada.ca/fr/licence-du-gouvernement-ouvert-canada
dc.subject - en: Nature and environment; Science and technology
dc.subject - fr: Nature et environnement; Sciences et technologie
dc.subject.en - en: Nature and environment; Science and technology
dc.subject.fr - fr: Nature et environnement; Sciences et technologie
dc.title - en: Using mercury stable isotopes to quantify directional soil‒ atmosphere Hg(0) exchanges in rice paddy ecosystems: Implications for Hg(0) emissions to the atmosphere from land surfaces
dc.type - en: Submitted manuscript
dc.type - fr: Manuscrit soumis
local.article.journalissue: 25
local.article.journaltitle: Environmental Science & Technology
local.article.journalvolume: 58
local.pagination: 27 pages
local.peerreview - en: No
local.peerreview - fr: Non

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